The hot and humid summers in Des Moines, Iowa, can get muggy and uncomfortable. You adjust the thermostat to a pleasant temperature. The AC kicks on right away. But, even after your air conditioner cycles, your home still feels damp and sticky.

That’s not very comfortable.

It can be frustrating when the air conditioner appears to work properly, yet your home doesn't actually feel comfortable. If your rooms feel humid but thermostat says cool, you're in good company. Many area homeowners have this problem.

Why is this? Temperature and humidity are two different measurements in your home. A temperature only tells you how comfortable the air is within the space. It doesn't measure the amount of moisture in the air. When moisture levels are too high, your home can feel several degrees warmer than the thermostat indicates, due to indoor humidity problems.

In this blog, you'll learn how humidity affects your indoor comfort levels, common reasons your home feels humid even when the temperature is right and easy troubleshooting steps you can try to reduce humidity in your Des Moines, Iowa, home. That way, you’ll know when to call experts like the team at Kohles & Bach Heating & Cooling for support.

Why a Home Can Feel Humid Even When the Temperature Is Nice and Cool

Indoor temperature is only part of what makes your home comfortable. Indoor humidity is an extremely important consideration. Most homes are the most comfortable when indoor relative humidity falls between 30% and 50%. When a home has high indoor humidity, the air feels hotter, denser and stickier—even if the actual air temperature is cool.

Too much indoor moisture can also contribute to dangerous mold growth, mildew, musty odors and other indoor air quality issues. That's why your house feels humid but the AC is running—your system may be cooling the air without removing enough moisture.

Reasons Your Home Feels Humid Even with the AC Running

Residing in Des Moines, Iowa, muggy conditions can be a frequent concern.

Many area homeowners deal with the same question: What's making my house feel humid?

There are several common causes. Understanding what's creating humidity problems is a good first step toward solving the problem.

Let's look at several common reasons for indoor humidity problems in Des Moines, Iowa:

1. Oversized Air Conditioning

An AC unit that's bigger than your home needs cools your home too quickly. The problem is an oversized AC often doesn’t remove humidity effectively because it shuts off before completing a full cooling cycle.

2. Blocked Air Filter

A blocked air filter restricts airflow throughout your HVAC system. This makes it more difficult for your equipment to remove moisture while cooling your home.

3. Blocked Condensate Drain

Your AC removes moisture from your indoor air and and then it drains from the equipment through a condensate line. If that drain becomes clogged, moisture can't exit the system properly, contributing to increased humidity levels.

4. Dirty Evaporator Coil

The evaporator coil extracts both heat and moisture from your home's air supply. Dirt buildup on the coil limits its effectiveness and often requires professional AC repair services to fix.

5. Loose Ductwork

Ductwork carries cool air throughout your home. Leaks in ductwork can allow warm, humid air from attics, crawl spaces or other uninhabited areas into your HVAC system. This additional moisture makes it more difficult to maintain comfortable humidity levels.

6. Thermostat Fan is on “On” Setting Change to “Auto”

If your thermostat fan is running on "On" instead of "Auto", the blower continues running after the cooling cycle is finished. This can blow moisture collected on the evaporator coil back into your home instead of giving it time for it to drain away.

7. Extremely Humid Weather

During the area’s extremely humid and hot summers, your HVAC system has to run longer to remove moisture from the air. Even when your air conditioner is operating correctly, sometimes your home feels muggy because outdoor humidity continues to seep into your home through doors, windows and normal air leakage.

8. Older Heating and Cooling Equipment

As HVAC systems age, they often become less capable at controlling humidity. HVAC maintenance enhances performance, increases efficiency and helps identify worn-out parts. Neglecting regular air conditioning maintenance can decrease performance, including your system's ability to reduce moisture.

What You Can Check Before Calling an HVAC Technician

If your house feels humid, there are some simple things you can check before booking service. These simple troubleshooting steps are easy ways to improve indoor comfort by helping your HVAC system remove moisture more efficiently.

  • Replace or inspect the air filter. A clean heating and cooling system air filter allows proper airflow, helping your system cool and dehumidify your home effectively.
  • Make sure the thermostat fan is set to Auto. This allows moisture to drain away after each cooling cycle instead of being sent back into your living spaces.
  • Check to ensure your supply and return vents are open and unblocked. Rugs or furniture over the vents or closed vents can limit airflow throughout your home.
  • Look for water around the indoor unit. Water near your AC equipment may suggest a clogged condensate drain or another drainage-related issue.
  • Monitor how your air conditioner should run. If the AC is short cycling or turning on and off repeatedly, or it seems to run constantly without cooling your home, it's time to have the system inspected by a professional.

Even if your thermostat still says cool but house feels humid, do not try repairs with refrigerant, electrical components or system components. Handling these repairs yourself may be tempting, but these repairs require advanced training and should always be left to a qualified HVAC technician.

Does Your Home Need a Whole-Home Dehumidifier?

If you struggle with humidity in your house during summer or year-round moisture problems, a whole-home dehumidifier may be the right choice. Unlike portable units that only remove humidity from one room or area, a whole-home dehumidifier works alongside your HVAC system to reduce humidity throughout your entire house.

Just one of Kohles & Bach Heating & Cooling's indoor air quality solutions, a whole-home dehumidifier makes your home more comfortable while lowering the risk of mold, musty odors and excess moisture. It can be a great choice for homes in damp climates or properties that continue to have humidity even with a properly functioning cooling system.

When It's Time to Book HVAC Service

Home HVAC humidity issues often point to an larger problem that needs professional repair. The technicians at Kohles & Bach Heating & Cooling will evaluate refrigerant charge, airflow, blower performance and evaporator coils to determine why your system isn't controlling humidity effectively. They can also evaluate ductwork, condensate drainage and overall system sizing to find the root cause.

We also can get you on the schedule for an HVAC tune-up. Routine seasonal tune-ups help identify small problems before they become complicated, costly repairs. That's why Kohles & Bach Heating & Cooling offers an HVAC maintenance plan that makes regular inspections easy and affordable.

If basic troubleshooting doesn't fix the problem, trust Kohles & Bach Heating & Cooling for dependable HVAC service in Des Moines, Iowa.

Schedule HVAC service online or call 515-278-2900 today to restore your comfort.

Frequently Asked Questions

A thermostat’s temperature reading tracks air temperature, not how much moisture is in the air. When inside moisture levels are high, your home can feel sticky and uncomfortable even though the thermostat shows the desired temperature.

It should. A properly functioning air conditioning removes both heat and excess moisture during normal cooling cycles.

It can. A dirty HVAC air filter reduces airflow, making it more difficult for your HVAC system to remove moisture. Replacing a dirty, grimy HVAC air filter is one of the simplest ways to improve performance, which includes lowering indoor humidity.

Many homes are comfortable when indoor relative humidity stays between 30% and 50%. Experts have found this humidity range not only boosts comfort, but also helps reduce the risk of mold and mildew.

Possible reasons include an oversized air conditioner, restricted airflow, dirty AC components, duct leaks, short cycling or a neglected air conditioner. A thorough HVAC inspection or routine maintenance visit can identify the exact cause.

Homes with persistent high indoor humidity even when the AC is running often can really benefit by installing a whole-home dehumidifier. It can be particularly useful in areas with hot, humid summer weather.

If swapping out your air filter and adjusting your thermostat settings don't help with your humidity issues—or you notice condensation, musty odors or mold—it's time to book professional HVAC service.

Reach out to Kohles & Bach Heating & Cooling for air conditioning repair in Des Moines, Iowa, to find and fix humidity problems before they become larger issues.